To answer this question, you need to understand the concept of tributary rivers and their relationship to the main river.

A tributary river is a river that flows into a larger river, known as the main river. The longest tributary river of India refers to the tributary that has the greatest length before it joins the main river.

Let's go through each option to understand why it is correct or incorrect:

Option A) Ganga - The Ganga is not the longest tributary river of India. It is the main river itself and is considered one of the most sacred rivers in Hinduism.

Option B) Yamuna - This option is correct. The Yamuna is the longest tributary river of India. It is a major tributary of the Ganga and has a total length of about 1,376 km.

Option C) Brahmaputra - The Brahmaputra is not the longest tributary river of India. It is a major river itself and flows through Tibet, India, and Bangladesh.

Option D) Godavari - The Godavari is not the longest tributary river of India. It is the second-longest river in India and is considered one of the holiest rivers in Hinduism. It flows through the states of Maharashtra, Telangana, Andhra Pradesh, Chhattisgarh, and Odisha.

The correct answer is B) Yamuna. This option is correct because the Yamuna is the longest tributary river of India before it joins the Ganga.

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